1. Shares held in custodial accounts for the benefit of Son #1 under the Uniform Transfer to Minors Act.

2. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purposes.

3. 1,174 market share units will vest on each of March 1, 2013, March 1, 2014, and March 1, 2015.

4. Each market share unit converts into the number of shares of common stock determined by applying a payout factor to the target number of shares vesting on a given date. The payout factor is a ratio of the average of the closing price on the vesting date plus the nine prior trading days divided by the average stock price on the grant date (also a 10-day average). The minimum payout factor that must be achieved to earn a payout is 60% and the maximum payout factor is 200%.

5. 1,316 market share units will vest on March 2, 2013, and 1,317 market share units will vest on March 2, 2014.

6. Twenty-five percent of the market share unit award will vest on each of the first, second, third, and fourth anniversaries of the grant date, starting on March 6, 2013.

7. 20,864 shares are currently exercisable. The remaining 10,288 shares will become exercisable on March 3, 2013.